Treadwear
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified
government test course. For example, a tire graded
150 would wear one and a half (1.5) times as well
on the government course as a tire graded 100.
The relative performance of tires depends upon the
actual conditions of their use, however, and may
depart significantly from the norm due to variations
in driving habits, service practices, and differences
in road characteristics and climate.
Traction – AA, A, B, C
The traction grades, from highest to lowest, are
AA, A, B, and C. Those grades represent the tire’s
ability to stop on wet pavement as measured under
controlled conditions on specified government test
surfaces of asphalt and concrete. A tire marked C
may have poor traction performance.
Warning
:
The traction grade assigned to this
tire is based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning, or peak traction
characteristics.
Temperature – A, B, C
The temperature grades are A (the highest), B,
and C, representing the tire’s resistance to the
generation of heat and its ability to dissipate heat
when tested under controlled conditions on a
specified indoor laboratory test wheel. Sustained
high temperature can cause the material of the tire
to degenerate and reduce tire life, and excessive
temperature can lead to sudden tire failure. The
grade C corresponds to a level of performance
which all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel than
the minimum required by law.
Warning
:
The temperature grade for this tire
is established for a tire that is properly inflated
and not overloaded. Excessive speed,
underinflation, or excessive loading, either
separately or in combination, can cause heat
buildup and possible tire failure.
5-80
Summary of Contents for 2008 9-7x
Page 74: ... NOTES 1 70 ...
Page 125: ... NOTES 3 3 ...
Page 126: ...Instrument Panel Overview 3 4 ...
Page 268: ...When you open the hood on the 5 3L V8 engine here is what you will see 5 14 ...
Page 270: ...When you open the hood on the 6 0L V8 engine here is what you will see 5 16 ...
Page 378: ... NOTES 5 124 ...
Page 393: ...Engine Drive Belt Routing 4 2L V6 Engine 5 3L V8 and 6 0L V8 Engines 6 15 ...
Page 412: ... NOTES 7 16 ...